Year | Value | 2021 | 2,348 | 2020 | 4,319 | 2019 | 14,937 | 2018 | 14,940 | 2017 | 14,842 | 2016 | 13,614 | 2015 | 12,646 | 2014 | 12,131 | 2013 | 12,079 | 2012 | 12,258 | 2011 | 12,353 | 2010 | 11,750 | 2009 | 11,144 | 2008 | 11,742 | 2007 | 12,090 | 2006 | 13,692 | 2005 | 14,743 | 2004 | 14,791 | 2003 | 12,969 | 2002 | 12,720 | 2001 | 12,269 | 2000 | 12,162 | 1999 | 10,700 | 1998 | 11,000 | 1997 | 11,000 | 1996 | 9,400 | 1995 | 8,900 | 1994 | 8,200 | 1993 | 8,000 | 1992 | 7,700 | 1991 | 7,700 | 1990 | 8,400 | 1989 | 6,400 | 1988 | 5,900 | 1987 | 5,800 | 1986 | 6,500 | 1985 | 6,400 | 1984 | 6,000 | 1983 | 5,400 | 1982 | 5,100 | 1981 | 5,000 | 1980 | 5,300 | 1979 | 4,200 | 1978 | 1,400 | 1977 | 1,300 | 1976 | 400 | 1975 | 400 | 1974 | 400 | 1973 | 300 | 1972 | 300 | 1971 | 300 | 1970 | 300 |
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